The U.S. Army Combat Readiness Center in Fort Rucker, Alabama, is investigating the incident.

Jack Plunkett/AP Photo

An entrance to Fort Hood Army Base in Fort Hood, Texas, near Killeen remains in lock-down following a mass shooting on Thursday, Nov. 5, 2009.

In June, West Point cadet Christopher Morgan, 22, of West Orange, New Jersey, died from injuries sustained from a military vehicle accident in the U.S. Military Academy’s training area. More than a dozen other cadets and soldiers were injured in that accident.

In April, Marine Corps Raider Staff Sgt. Joshua Braica, 29, of Sacramento, was killed in a tactical vehicle accident at Camp Pendleton, California. Two other Marine Raiders were also injured in the crash, which occurred during a unit training exercise.